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by dragontamer
1291 days ago
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> I am confused, CPUs have dedicated instructions for AES encryption and CRC32. Are they slower than AVX512? Those instructions are literally AVX instructions, and have been _upgraded_ in AVX512 to be 512-bit wide now. If you use the older 128-bit wide AES-NI instruction, rather than the AVX512-AES-NI instructions, you're 4x slower than me. AVX512 upgrades _ALL_ AVX instructions to 512-bits (and mind you, AES-NI was stuck on 128-bits, so the upgrade to 512-bit is a huge upgrade in practice). ----- EDIT: CRC32 is implemented with the PCLMULQDQ instruction, which has also been upgraded to AVX512. |
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